On slide 133 of her much-anticipated annual Internet Trends report, venture capitalist Mary Meeker made a curious comparison. She put a graph of iPhone sales side-by-side with a sales estimate for the Echo, the newish wireless speaker and voice-activated personal assistant from Amazon. That juxtaposition might seem strange, but Meeker was making a point. Sales of the iPhone have been slowing, and according to Meeker's projections, they'll go into decline by the end of 2016. Right as this is happening, sales of the Amazon Echo are starting to take off. It's a sign that using voice as a way to command your tech is steadily gaining traction.